Samyang 21mm F1.4 ED AS UMC CS Lens - Micro Four Thirds Mount

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The Samyang 21mm F1.4 ED AS UMC CS Lens is a manual focus lens for mirrorless cameras with APS-C or smaller sized sensors. Equivalent to standard - wide 31.5mm on 1.5x crop APS-C sensor, 34mm on 1.6x Crop or a standard 42mm lens on 2x crop MFT sensor. A great manual focus, low light lens, perfectly suited as a standard prime, fixed focal length walk around lens with general photographic applications.

The Samyang 21mm features Samyang’s exceptional optical technology, with eight glass elements in seven optical groups, including one extra low dispersion lens (ED) and three glass aspherical lenses (ASP) to minimise the unnecessary light dispersion and deliver super high resolution throughout the centre to corner of image. The lens also features Ultra Multi Coating (UMC) to optimise the light penetration and minimise flare and ghost. With a minimum focusing distance of only 0.28m it is a versatile lens for relatively close focus work.

Fast f1.4 aperture with the 9 circular aperture blades are designed to offer subject separation and limited depth of field photography with beautiful out of focus areas (bokeh). The solid frame of the lens is made of high-strength aluminium alloy. As the lens is specifically designed for the mirrorless Compact System Cameras (CSC) such as Sony NEX, Olympus PEN/OM-D, Panasonic Lumix G, Fujifilm X series, the Samyang 21mm is compact and lightweight, weighing approximately 275g, making it a very portable lens.

  • Extra low dispersion (ED)
  • Glass aspherical lenses (AS)
  • 9 circular aperture blades
  • Ultra Multi Coating (UMC)
  • F1.4 wide apertures


Low dispersion
Low dispersion lenses decrease dispersion of unnecessary light so that make aberration little effectively.

Glass aspherical lenses
The adaption glass aspherical lenses reproduce aberration to get high quality image in centre and edge of frame and excellent contrast.

9 circular aperture blades
This lens is designed to have 9 circular aperture blades to render beautiful buttery bokeh.

Ultra Multi Coating (UMC)
Samyang applies the UMC (Ultra Multi Coating) of their own technology to reduce flare and ghost as much as possible and get clear and fresh colour image.

F1.4 wide aperture
Smooth focal control gives you precise adjustment and also F1.4 wide aperture gives you touching photography.


Manufacturer Samyang Optics
Model 21mm F1.4 ED AS UMC CS
Lens type Standard prime lens for Mirrorless APS-C or smaller sensor
Focal length 21mm
Maximum aperture f1.4
Min aperture f22
Angle of view 69.3° (APS-C), 55.6° (MFT)
Min focusing distance 0.28m
No. of diaphragm blades 9
Focus type MF (Manual Focus only)
Lens construction 8 element, 7 groups (1 elements low-dispersion glass (ED) and 3 Aspheric elements)
Dimensions 54.3 diameter
Weight 290g (approx. dependant on mount)
Lens hood Detachable, included
Filter size 58mm